The radian is a unit of measure for angles used mainly in trigonometry. It is used as an alternative to degrees. Whereas, in degrees a full circle is 360 degrees, in radians a full circle is 2π radians: It is…

A leap year is a calendar year that contains an additional day (29th of February) added to keep the calendar year synchronised with the astronomical year or seasonal year (which contains roughly 365¼ days or 365.242375 days to be more…